JP6381433B2 - Camera system and blur correction method thereof - Google Patents

Description

  The present invention relates to a camera system having a shake correction function in both an interchangeable lens and a camera body, and a shake correction method thereof.

In recent years, a camera equipped with a camera shake correction function has become common, and it has become possible to shoot a good photographic image without image blurring without special attention in handheld shooting.
In an interchangeable lens camera in which the photographing lens can be exchanged according to the photographing application, the camera shake correction function may be mounted on the interchangeable lens or the camera body.

  When the interchangeable lens is equipped with a camera shake correction function, a sensor that detects the movement applied to the camera is mounted on the interchangeable lens, and a part of the photographic lens group is placed in a direction that cancels the detected blur on the surface perpendicular to the optical axis. The movement is corrected by moving.

  On the other hand, when the camera shake correction function is mounted on the camera body, a sensor that detects the movement applied to the camera is mounted on the camera body, and the image sensor is moved in a direction to cancel the detected shake, thereby correcting the shake. .

  Whether the camera shake correction function is mounted on the interchangeable lens or the camera body depends on the camera system and its manufacturer because both have merits and demerits, but in each camera system with common connection compatibility, In some cases, both the interchangeable lens and the camera body have a camera shake correction function, and this combination may be used.

  In such a case, if both camera shake correction functions operate at the same time, the image blur caused by the camera shake is excessively corrected, and the resolution of the captured image is reduced due to the image blur caused by the excessive correction. The effect of camera shake correction cannot be obtained.

  Therefore, when shooting with an interchangeable lens equipped with a camera shake correction function mounted on a camera body equipped with a camera shake correction function, one camera shake correction function is stopped or both camera shake correction functions are disabled. It is necessary to take measures such as sharing and operating at a predetermined ratio.

  As a solution focusing on the above problems, for example, in the camera system described in Patent Document 1, the camera having the first shake correction unit and the second shake correction unit are mounted and the camera is mounted. A shake detection unit provided in one of the camera and the lens device, and a control unit for obtaining a first shake correction amount based on a detection result of the shake detection unit. Then, the control means outputs the second shake correction amount based on the first shake correction amount and the movement amount of the first shake correction means or the second shake correction means driven according to the first shake correction amount. Therefore, even when a plurality of image blur correction functions are combined, accurate image blur correction can be performed.

JP 2006-126668 A

  However, in the camera system described in Patent Document 1 described above, there is no problem when the correction performances of both the shake correction units are similar, but when there is a difference between the correction performances, the two are operated in combination. If it does, it will be influenced by the shake correction means on the side where the correction performance is low, and in some cases, the correction performance may be lower than when only one shake correction means is used.

  Further, in the camera system described in Patent Document 1, shake correction by both shake correction means is performed based on the detection result of the shake detection means provided in one of the camera and the lens device, so both shake detection is performed. Of the means, the shake detection means with higher detection accuracy may be used. However, in the camera system described in Patent Document 1, it is necessary to transmit the detection result of one (for example, camera) shake detection means to the other (for example, a lens device), and thus a shake correction operation associated with a signal delay caused by the transmission. There is a risk that the shake correction performance may be reduced due to the delay of the response of the camera and the deterioration of the shake detection signal due to the routing of the signal wiring necessary for the transmission. Further, in the camera system described in Patent Document 1, it is necessary to transmit the remaining correction information that cannot be corrected by the shake correction unit of one (for example, the lens apparatus) to the other (for example, the camera). However, problems similar to those described above may occur.

  Further, in general, an angular velocity sensor that can be used as a shake detection unit is more expensive as a higher accuracy, and therefore there is a situation in which a highly accurate angular velocity sensor cannot be used unnecessarily from the viewpoint of cost reduction.

  Based on the above situation, the present invention is a case where there is a difference in blur detection accuracy of both blur correction functions when blur correction is performed by combining the blur correction functions of both the interchangeable lens and the camera body. Another object of the present invention is to provide a camera system and a shake correction method thereof that can improve the performance of shake correction as compared with the case where only one shake correction function is used.

  According to a first aspect of the present invention, there is provided an interchangeable lens that includes a first blur correction unit that corrects image blur due to blur, and a camera body that includes a second blur correction unit that corrects image blur due to blur. The first camera shake correction unit includes a first camera shake amount detecting unit that detects a camera shake amount, and a camera shake amount detected by the first camera shake amount detecting unit. A first reference value subtraction unit that subtracts a first reference value corresponding to an output value of the first blur detection unit, wherein the second blur correction unit detects a second blur value for detecting a blur amount. A second reference value that subtracts a second reference value corresponding to an output value of the second blur detection unit at rest from a blur amount detected by an amount detection unit and the second blur amount detection unit A subtraction unit, wherein the camera system is detected by the first blur amount detection unit during a predetermined period. A first average value calculating unit that calculates an average value of blur amounts obtained by subtracting the first reference value by the first reference value subtracting unit, and the second blur amount during the predetermined period. A second average value calculating unit that calculates an average value of blur amounts detected by the detecting unit and subtracting the second reference value by the second reference value subtracting unit; and the first average value calculating unit A reference value correction unit that corrects the first reference value or the second reference value based on the difference between the average value calculated by the second average value calculation unit and the average value calculated by the second average value calculation unit; A camera system is provided.

  According to a second aspect of the present invention, in the first aspect, the camera system includes a first storage unit that stores first blur detection accuracy information related to blur detection accuracy of the first blur correction unit; A second storage unit storing second blur detection accuracy information related to blur detection accuracy of the second blur correction unit; first blur detection accuracy information stored in the first storage unit; and Based on the second blur detection accuracy information stored in the second storage unit, it is determined which of the first blur correction unit and the second blur correction unit has higher blur detection accuracy. The reference value correction unit is configured to detect the first blur correction unit when the determination unit determines that the blur detection accuracy is higher than that of the second blur correction unit. 2 is corrected, and the second shake correction unit corrects the first shake correction. Correcting the first reference value when the blur detection accuracy is determined by the high and the determination portion than to provide a camera system.

  According to a third aspect of the present invention, in the first or second aspect, the camera body is detected by the first blur amount detection unit during the predetermined period and is detected by the first reference value subtraction unit. The camera body transmits a command for acquiring from the interchangeable lens an average value or an integrated value of the blur amount obtained by subtracting the first reference value, and the camera body is configured to provide an offset value of the first reference value. Is transmitted to the interchangeable lens.

  According to a fourth aspect of the present invention, in the second or third aspect, the camera body acquires the first blur detection accuracy information stored in the first storage unit from the interchangeable lens. A camera system is provided that transmits a command to the interchangeable lens.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the first blur correction unit is configured such that the first reference value is subtracted by the first reference value subtraction unit. A first blur correction driving unit that drives a first blur correction mechanism based on a blur amount and a blur correction sharing ratio of the first blur correction unit and the second blur correction unit; The second blur correction unit drives the second blur correction mechanism based on the blur amount obtained by subtracting the second reference value by the second reference value subtraction unit and the blur correction sharing ratio. A camera system including two shake correction drive units is a sixth aspect of the present invention, in the fifth aspect, the shake correction share ratio is in optical system state information relating to the state of the optical system included in the interchangeable lens. A camera system determined based on the above is provided.

  In a seventh aspect of the present invention, the first reference value corresponding to the output value of the first blur amount detection unit at rest is subtracted from the blur amount detected by the first blur amount detection unit, Based on the blur amount after the subtraction, an interchangeable lens including a first blur correction unit that corrects an image blur due to blur and a blur amount detected by a second blur amount detection unit are used to determine the first at rest. A camera body including a second blur correction unit that subtracts a second reference value corresponding to an output value of the second blur amount detection unit and corrects an image blur due to the blur based on the blur amount after the subtraction; , A blur correction method for a camera system including a first blur value that is detected by the first blur amount detection unit and subtracted from the first reference value during a predetermined period. An average value is calculated and detected by the second shake amount detection unit during the predetermined period, A second average value, which is an average value of blur amounts obtained by subtracting two reference values, and based on a difference between the first average value and the second average value, the first reference value Alternatively, a blur correction method for correcting the second reference value is provided.

  According to the present invention, when blur correction is performed by combining the blur correction functions of both the interchangeable lens and the camera body, even if there is a difference in the blur detection accuracy of both blur correction functions, only one blur correction function is provided. The performance of blur correction can be improved compared to the case where it is used.

It is a figure explaining the definition of the direction in the camera system concerning one embodiment. It is a figure for demonstrating the basic idea of the blurring correction | amendment performed with the camera system which concerns on one Embodiment, Comprising: An example of the time change of the angular velocity detected by the angular velocity sensor with which each of a camera body and an interchangeable lens is provided FIG. It is a figure which shows the structural example of the camera system which concerns on one embodiment. It is a figure which shows the structural example of a blurring correction | amendment microcomputer in detail. It is a figure which shows the structural example of LCU in detail. It is an example of the flowchart which shows the processing content of the reference value correction process which the system controller of a camera body performs. It is an example of the flowchart which shows the processing content of the reference value correction process which the blur correction microcomputer of a camera body performs. It is an example of the flowchart which shows the processing content of the reference value correction | amendment process which LCU of an interchangeable lens performs. 6 is an example of a flowchart showing details of processing contents when a system controller of a camera body performs reference value correction processing while communicating with each of a camera shake correction microcomputer and an interchangeable lens LCU.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the following, first, the definition of the direction in the camera system according to the present embodiment will be described with reference to FIG. 1, and the basic concept of the blur correction performed in the camera system according to the present embodiment will be described with reference to FIG. After that, the configuration and operation of the camera system according to the present embodiment will be described in detail with reference to FIGS.

FIG. 1 is a diagram illustrating the definition of directions in the camera system according to the present embodiment.
As shown in FIG. 1, the camera system according to the present embodiment is an interchangeable lens type camera system in which an interchangeable lens 2 is mounted on a camera body 1, and in the camera system, an X direction, a Y direction, and a Z direction The direction, pitch direction, yaw direction, and roll direction are defined as follows.

  The left-right direction (horizontal direction) of the camera body 1 is defined as the X direction. In the X direction, the right direction when the front of the camera body 1 is viewed is defined as + X direction, and the left direction is defined as -X direction. Note that the X direction also corresponds to the left-right direction of an imaging surface of an imaging device described later.

  The vertical direction of the camera body 1 is the Y direction. In the Y direction, the upper direction is the + Y direction, and the lower direction is the -Y direction. Note that the Y direction also corresponds to the up and down direction of the imaging surface of the imaging element described later.

  The optical axis direction of the interchangeable lens 2 is defined as the Z direction. In the Z direction, the direction from the back to the front of the camera body 1 is defined as + Z direction, and the direction from the front to the back of the camera body 1 is defined as -Z direction.

  The rotation direction with the X axis as the rotation axis is defined as the pitch direction. In the pitch direction, the left rotation toward the + X direction is defined as the + pitch direction, and the right rotation toward the + X direction is defined as the −pitch direction.

  The rotation direction with the Y direction axis as the rotation axis is the yaw direction. In the yaw direction, a right rotation toward the + Y direction is defined as a + yaw direction, and a left rotation toward the + Y direction is defined as a −yaw direction.

  The rotation direction with the axis in the Z direction as the rotation axis is the roll direction. In the roll direction, the left rotation toward the + Z direction is defined as the + roll direction, and the right rotation toward the + Z direction is defined as the −roll direction.

In addition, since the positive / negative (+,-) of the direction defined in this way is dependent on the mounting direction of the angular velocity sensor mentioned later, of course, it is not limited to the above.
FIG. 2 is a diagram for explaining a basic concept of blur correction performed in the camera system according to the present embodiment, which is detected by an angular velocity sensor described later included in each of the camera body 1 and the interchangeable lens 2. It is a figure which shows an example of the time change of angular velocity.

  In FIG. 2, the horizontal axis represents time t, and the vertical axis represents angular velocity ω. A curve indicated by a dotted line is a diagram illustrating an example of a temporal change in angular velocity detected by the angular velocity sensor on the camera body 1 side, and a curve indicated by a solid line indicates the angular velocity detected by the angular velocity sensor on the interchangeable lens 2 side. It is a figure which shows an example of a time change. However, the time change of both angular velocities is the time change of the angular velocities in the same direction (yaw direction or pitch direction).

  If the interchangeable lens 2 is attached to the camera body 1 and the camera body 1 and the interchangeable lens 2 are integrated, ideally, the angular velocities of both coincide. However, due to the difference in detection accuracy between the two angular velocity sensors, in actuality, as shown in FIG.

  Various noises are superimposed on the angular velocity detected by the angular velocity sensor, and the noise that greatly affects the image stabilization performance is caused by the deviation of the reference value (angular velocity detected by the stationary angular velocity sensor). There is offset noise. If an error is included in the detected angular velocity due to the generation of the offset noise, even if the blur correction is performed based on the angular velocity, the appropriate blur correction cannot be performed. The cause of the offset noise is mainly the temperature drift of the angular velocity sensor (change in the reference value due to temperature characteristics).

  In the example shown in FIG. 2, if the detection accuracy of the angular velocity sensor on the interchangeable lens 2 side is higher than the detection accuracy of the angular velocity sensor on the camera body 1 side, the angular velocity on the interchangeable lens 2 side is assumed to be a true value. The angular velocity on the body 1 side can be considered as a value including a certain error with respect to the true value.

  In this case, the average value of the angular velocities in a certain period (the “integration period” shown in FIG. 2 (for example, the period from t1 to t2 or t2 to t3)) in the angular velocity changes on both the camera body 1 side and the interchangeable lens 2 side is obtained. The offset noise included in the angular velocity on the camera body 1 side can be obtained by obtaining the difference between the average values of the two. Then, by subtracting the offset noise from the angular velocity on the camera body 1 side, the detection accuracy of the angular velocity sensor on the camera body 1 side can be improved up to the detection accuracy of the angular velocity sensor on the interchangeable lens 2 side.

  In the camera system according to the present embodiment, after improving the detection accuracy of one (lower detection accuracy) angular velocity sensor to the detection accuracy equivalent to the other (higher detection accuracy) angular velocity sensor, By performing the blur correction by combining both, the blur correction performance is improved as compared with the case where the blur correction is performed only by one.

FIG. 3 is a diagram illustrating a configuration example of the camera system according to the present embodiment.
As shown in FIG. 3, the camera system according to the present embodiment has a configuration in which an interchangeable lens 2 is attached to a camera body 1. In addition, the camera body 1 is configured so that the interchangeable lens 2 can be freely attached and detached. When the interchangeable lens 2 is attached to the camera body 1, the camera body 1 is attached to a lens mount connecting portion (not shown) provided in the interchangeable lens 2. This is performed by fitting each other with a body mount connecting portion (not shown) provided. As a result, the interchangeable lens 2 is fixed to the camera body 1, and terminals provided at each mount connection portion are also electrically connected to each other, and the camera body 1 and the interchangeable lens 2 are connected via the contact points 3. Communication between the two becomes possible.

  The camera body 1 includes a focal plane shutter 11, an image sensor 12, an image sensor drive unit 13, a system controller 14, a shake correction microcomputer 15, a yaw angular velocity sensor 16a, a pitch angular velocity sensor 16b, and a ROM (Read Only). Memory) 17.

  The focal plane shutter 11 is disposed in front of the image sensor 12 and performs an opening / closing operation under the control of the system controller 14, thereby bringing the imaging surface of the image sensor 12 into an exposure state or a light shielding state.

  The image sensor 12 is an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), for example. Under the control of the system controller 14, the subject image formed on the imaging surface is converted into an electrical signal. Convert (photoelectric conversion). The converted electrical signal is read out as a video signal by the system controller 14.

  The image sensor driving unit 13 has a configuration that supports the image sensor 12 and moves the image sensor 12 in a plane direction perpendicular to the optical axis of the optical system 21 under the control of the blur correction microcomputer 15. By this movement, the position of the subject image formed on the imaging surface of the image sensor 12 changes.

  The system controller 14 communicates with the LCU (Lens Control Unit) 22 and the blur correction microcomputer 15 via the contact 3 and controls the overall operation of the camera system (camera body 1 and interchangeable lens 2). . For example, the system controller 14 controls the LCU 22 to control focusing, zooming, a diaphragm (not shown), and the like. For example, the system controller 14 controls the focal plane shutter 11 and the image sensor 12. Further, for example, the system controller 14 reads a video signal from the image sensor 12 and converts it into image data of a predetermined format. Further, for example, the system controller 14 performs reference value correction processing described later with reference to FIG. 6, various processing described later with reference to FIG.

  The shake correction microcomputer 15 performs shake correction under the control of the system controller 14. For example, the shake correction microcomputer 15 performs shake correction based on the output of the yaw angular velocity sensor 16a, the output of the pitch angular velocity sensor 16b, and information on a shake correction sharing ratio (hereinafter referred to as “shake correction sharing ratio information”). The image sensor driving unit 13 is controlled so as to move the image sensor 12 in a direction to cancel the accompanying image blur. For example, the blur correction microcomputer 15 performs a reference value correction process which will be described later with reference to FIG. 7 and various processes which will be described later with reference to FIG. Details of the blur correction microcomputer 15 will be described later with reference to FIG.

The yaw angular velocity sensor 16a detects the rotational movement (posture change) of the camera body 1 in the yaw direction as an angular velocity (hereinafter referred to as “yaw angular velocity”).
The pitch angular velocity sensor 16b detects the rotational movement (posture change) of the camera body 1 in the pitch direction as an angular velocity (hereinafter referred to as “pitch angular velocity”).

  The ROM 17 is a non-volatile memory that stores information relating to the blur detection accuracy on the camera body 1 side (hereinafter referred to as “body-side blur detection accuracy information”). The body-side blur detection accuracy information includes, for example, accuracy information of a reference value of the yaw angular velocity sensor 16a (hereinafter referred to as “body-side yaw reference value”) and a reference value of the pitch angular velocity sensor 16b (hereinafter referred to as “body-side pitch reference value”). Contains accuracy information. The accuracy information of the body side yaw reference value and the body side pitch reference value is represented by a unit system value such as dps (degree per second), for example. The smaller this value, the higher the accuracy.

  The interchangeable lens 2 includes an optical system 21, an LCU 22, an optical system driving unit 23, a yaw (Yaw) angular velocity sensor 24 a, a pitch (Pitch) angular velocity sensor 24 b, and a thermistor 25. The interchangeable lens 2 also includes a diaphragm (not shown).

  The optical system 21 forms a light beam from the subject on the imaging surface of the imaging element 12 as a subject image. The optical system 21 includes a focus lens, a zoom lens, and a blur correction lens, which are not shown.

  The LCU 22 communicates with the system controller 14 via the contact 3 and controls the entire operation (including the blur correction operation) of the interchangeable lens 2. For example, the LCU 22 controls focusing, zooming, aperture, and the like under the control of the system controller 14. Further, for example, the LCU 22 moves the blur correction lens in a direction to cancel image blur due to blur based on the output of the yaw angular velocity sensor 16a, the output of the pitch angular velocity sensor 16b, and blur correction sharing ratio information described later. The optical system drive unit 23 is controlled so that Further, for example, the LCU 22 performs reference value correction processing described later with reference to FIG. 8, various processing described later with reference to FIG. Details of the LCU 22 will be described later with reference to FIG.

  The LCU 22 includes a ROM 22a. The ROM 22a is a non-volatile memory that stores information relating to blur detection accuracy on the interchangeable lens 2 side (hereinafter referred to as “lens-side blur detection accuracy information”). The lens side blur detection accuracy information includes, for example, accuracy information of a reference value of the yaw angular velocity sensor 24a (hereinafter referred to as “lens side yaw reference value”) and a reference value of the pitch angular velocity sensor 24b (hereinafter referred to as “lens side pitch reference value”). Contains accuracy information. The accuracy information of the lens side yaw reference value and the lens side pitch reference value is represented by a unit system value such as dps, for example. The smaller this value, the higher the accuracy.

  The optical system drive unit 23 moves the blur correction lens included in the optical system 21 in a surface direction perpendicular to the optical axis of the optical system 21 under the control of the LCU 22. By this movement, the position of the subject image formed on the imaging surface of the image sensor 12 changes.

The yaw angular velocity sensor 24a detects the rotational movement (posture change) of the interchangeable lens 2 in the yaw direction as an angular velocity (hereinafter referred to as “yaw angular velocity”).
The pitch angular velocity sensor 24b detects the rotational movement (posture change) of the interchangeable lens 2 in the pitch direction as an angular velocity (hereinafter referred to as “pitch angular velocity”).

The thermistor 25 detects temperatures near the yaw angular velocity sensor 24a and the pitch angular velocity sensor 24b.
In the camera system according to the present embodiment, the interchangeable lens 2 includes the thermistor 25. As will be described in detail later with reference to FIG. 5, the LCU 22 uses a reference value (lens side) corresponding to the temperature detected by the thermistor 25. (Yaw reference value and lens side pitch reference value) are used, but the camera body 1 does not have such a configuration, so the lens side yaw reference value is more accurate than the body side yaw reference value. The accuracy of the lens side pitch reference value is higher than the accuracy of the body side pitch reference value.

FIG. 4 is a diagram showing a detailed configuration example of the blur correction microcomputer 15.
As shown in FIG. 4, the shake correction microcomputer 15 includes an ADC (Analog-to-digital converter) 151 (151a, 151b), a reference value subtraction unit 152 (152a, 152b), and a yaw (Yaw) angle shake calculation unit. 153a, a pitch angle blur amount calculation unit 153b, a correction amount calculation unit 154, a driver 155 (155a, 155b), an integration unit 156 (156a, 156b), and a communication unit 157.

  The ADC 151a converts an analog signal that is an output signal of the yaw angular velocity sensor 16a into a digital signal. The ADC 151b converts an analog signal that is an output signal of the pitch angular velocity sensor 16b into a digital signal.

  The reference value subtraction unit 152a subtracts the body side yaw reference value from the yaw angular velocity that is an output signal (digital signal) of the ADC 151a. The body side yaw reference value is, for example, an average value of yaw angular velocities obtained via the yaw angular velocity sensor 16a and the ADC 151a in a predetermined period in the camera body 1 in a stationary state. Further, the reference value subtraction unit 152a adds a body-side yaw direction offset value (hereinafter referred to as “body-side yaw offset value”) transmitted from the system controller 14 via the communication unit 157 to the body-side yaw reference value. The body side yaw reference value is updated. As a result, the body side yaw reference value is corrected, and the offset noise caused by the deviation of the body side yaw reference value is removed. Details of the body side yaw offset value will be described later.

  The reference value subtraction unit 152b subtracts the body side pitch reference value from the pitch angular velocity that is an output signal (digital signal) of the ADC 151b. The body-side pitch reference value is, for example, an average value of pitch angular velocities obtained via the pitch angular velocity sensor 16b and the ADC 151b during a predetermined period in the camera body 1 in a stationary state. Further, the reference value subtraction unit 152a adds a body-side pitch direction offset value (hereinafter referred to as “body-side pitch offset value”) transmitted from the system controller 14 via the communication unit 157 to the body-side pitch reference value. The body side pitch reference value is updated. As a result, the body-side pitch reference value is corrected, and offset noise generated due to the deviation of the body-side pitch reference value is removed. Details of the body side pitch offset value will be described later.

  Due to the operations of the reference value subtracting unit 152a and the reference value subtracting unit 152b, the respective output values become values having positive and negative signs indicating the rotation direction, and become 0 when the camera body 1 is stationary. Further, each of the body side yaw reference value and the body side pitch reference value before the update is not limited to those obtained by averaging the angular velocities as described above, but may be obtained by other methods. .

The yaw angle blur amount calculation unit 153a time-integrates the yaw angular velocity obtained by subtracting the body side yaw reference value by the reference value subtraction unit 152a, and calculates an angle change amount in the yaw direction.
The pitch angle blur amount calculation unit 153b time-integrates the pitch angular velocity from which the body side pitch reference value is subtracted by the reference value subtraction unit 152b, and calculates an angle change amount in the pitch direction.

  The correction amount calculation unit 154 is based on the angle change amount in the yaw direction calculated by the yaw angle blur amount calculation unit 153a and the focal length information of the optical system 21 in the X direction of the subject image on the imaging surface of the image sensor 12. A movement amount (image blur amount) is calculated, and a correction amount in the X direction for canceling the movement amount in the X direction of the subject image is calculated based on the movement amount in the X direction and the shake correction sharing ratio information. In addition, the correction amount calculation unit 154 determines the Y of the subject image on the imaging surface of the image sensor 12 based on the angle change amount in the pitch direction calculated by the pitch angle blur amount calculation unit 153b and the focal length information of the optical system 21. The amount of movement in the direction (image blur amount) is calculated, and the amount of correction in the Y direction for canceling the amount of movement of the subject image in the Y direction is calculated based on the amount of movement in the Y direction and the shake correction sharing ratio information. . The focal length information and the shake correction sharing ratio information of the optical system 21 are transmitted from the system controller 14 via the communication unit 157.

  The driver 155 a outputs a drive pulse corresponding to the correction amount in the X direction calculated by the correction amount calculation unit 154 to the image sensor driving unit 13. Thereby, the image sensor 12 is moved in the X direction by the amount corresponding to the correction amount in the X direction by the image sensor driving unit 13.

  The driver 155 b outputs a drive pulse corresponding to the correction amount in the Y direction calculated by the correction amount calculation unit 154 to the image sensor driving unit 13. Thereby, the image sensor 12 is moved in the Y direction by the amount corresponding to the correction amount in the Y direction by the image sensor driving unit 13.

  The integrating unit 156a integrates the yaw angular velocity obtained via the yaw angular velocity sensor 16a, the ADC 151a, and the reference value subtracting unit 152a. Further, in response to the reception of the average value acquisition request command transmitted from the system controller 14 via the communication unit 157, the integration unit 156a obtains the average value of the yaw angular velocities accumulated so far, and obtains the average value thereof as the communication unit 157. Is transmitted to the system controller 14 and the accumulated yaw angular velocity is cleared. Thus, every time the average value acquisition request command transmitted from the system controller 14 is received, the yaw angular velocity accumulated from the reception of the previous average value acquisition request command to the reception of the current average value acquisition request command is The average value is transmitted to the system controller 14. Therefore, the integration period of the yaw angular velocity by the integrating unit 156a can be controlled by the system controller 14. The longer the integration period, the more accurate the body side yaw offset value can be calculated.

  The integrating unit 156b integrates the pitch angular velocity obtained through the pitch angular velocity sensor 16b, the ADC 151b, and the reference value subtracting unit 152b. Further, in response to the reception of the average value acquisition request command transmitted from the system controller 14 via the communication unit 157, the integration unit 156b obtains the average value of the pitch angular velocities accumulated so far, and obtains the average value of the pitch angular velocity. And the pitch angular velocity accumulated so far is cleared. Thus, every time an average value acquisition request command is received from the system controller 14, the average value of pitch angular velocities accumulated from the reception of the previous average value acquisition request command to the reception of the current average value acquisition request command is calculated. It is transmitted to the system controller 14. Therefore, the integration period of the pitch angular velocity by the integrating unit 156b can be controlled by the system controller 14. The longer the integration period, the more accurate the body side pitch offset value can be calculated.

The communication unit 157 performs communication with the system controller 14.
FIG. 5 is a diagram illustrating a detailed configuration example of the LCU 22.
As shown in FIG. 5, the LCU 22 includes an ADC 221 (221a, 221b, 221c), a reference value subtraction unit 222 (222a, 222b), a reference value output unit 223, a yaw angle blur amount calculation unit 224a, a pitch ( Pitch) angle blur amount calculation unit 224b, correction amount calculation unit 225, driver 226 (226a, 226b), integration unit 227 (227a, 227b), communication unit 228, lens control unit 229, and ROM 22a described above.

  The ADC 221a converts an analog signal that is an output signal of the yaw angular velocity sensor 24a into a digital signal. The ADC 221b converts an analog signal that is an output signal of the pitch angular velocity sensor 24b into a digital signal. The ADC 221c converts an analog signal that is an output signal of the thermistor 25 into a digital signal.

  The reference value subtraction unit 222a subtracts the lens side yaw reference value from the yaw angular velocity that is an output signal (digital signal) of the ADC 221a. The lens side yaw reference value is output from the reference value output unit 223. Further, the reference value subtraction unit 222a adds the lens side yaw direction offset value (hereinafter referred to as “lens side yaw offset value”) transmitted from the system controller 14 via the communication unit 228 to the lens side yaw reference value. The lens side yaw reference value is updated. As a result, the lens side yaw reference value is corrected, and offset noise generated due to the deviation of the lens side yaw reference value is removed. Details of the lens side yaw offset value will be described later.

  The reference value subtraction unit 222b subtracts the lens side pitch reference value from the pitch angular velocity that is an output signal (digital signal) of the ADC 221b. The lens side pitch reference value is output from the reference value output unit 223. Further, the reference value subtraction unit 222b adds the lens side pitch direction offset value (hereinafter referred to as “lens side pitch offset value”) transmitted from the system controller 14 via the communication unit 228 to the lens side pitch reference value. The lens side pitch reference value is updated. Thereby, the lens-side pitch reference value is corrected, and offset noise generated due to the deviation of the lens-side pitch reference value is removed. Details of the lens side pitch offset value will be described later.

  Note that, by such processing of the reference value subtraction unit 222a and the reference value subtraction unit 222b, the respective output values become values having positive and negative signs indicating the rotation direction, and become 0 when the interchangeable lens 2 is stationary.

  The reference value output unit 223 includes a table indicating a correspondence relationship between the temperature, the lens side yaw reference value, and the lens side pitch reference value. Based on the table, the reference value output unit 223 corresponds to the temperature that is an output signal (digital signal) of the ADC 221c. The lens side yaw reference value is output to the reference value subtraction unit 222a, and the lens side pitch reference value corresponding to the temperature is output to the reference value subtraction unit 222b. Here, the lens side yaw reference value corresponding to the temperature is, for example, that the yaw angular velocity sensor 24a and the ADC 221a are in a predetermined period when the interchangeable lens 2 is in a stationary state and the ambient temperature of the yaw angular velocity sensor 24a is the temperature. It is the average value of the yaw angular velocity obtained through this. Further, the lens side pitch reference value corresponding to the temperature is obtained via the pitch angular velocity sensor 24b and the ADC 221b during a predetermined period when the interchangeable lens 2 is in a stationary state and the ambient temperature of the pitch angular velocity sensor 24b is at that temperature, for example. The average value of the pitch angular velocities obtained. In addition, each of the lens side yaw reference value and the lens side pitch reference value corresponding to the temperature is not limited to the value obtained by averaging the angular velocities in this way, and may be obtained by other methods. .

  By the operation of the reference value output unit 223, the reference value subtraction unit 222 (222a, 222b) subtracts the reference value corresponding to the temperature detected by the thermistor 25, and therefore the angular velocity sensor 24 (24a, 24b). ) Due to temperature drift is suppressed, and more accurate shake detection is possible.

The yaw angle blur amount calculation unit 224a time-integrates the yaw angular velocity obtained by subtracting the lens side yaw reference value by the reference value subtraction unit 222a, and calculates an angle change amount in the yaw direction.
The pitch angle blur amount calculation unit 224b time-integrates the pitch angular velocity obtained by subtracting the lens side pitch reference value by the reference value subtraction unit 222b, and calculates an angle change amount in the pitch direction.

  The correction amount calculation unit 225 uses the angle change amount in the yaw direction calculated by the yaw angle blur amount calculation unit 224a and the focal length information of the optical system 21 in the X direction of the subject image on the imaging surface of the image sensor 12. A movement amount (image blur amount) is calculated, and a correction amount in the X direction for canceling the movement amount in the X direction of the subject image is calculated based on the movement amount in the X direction and the shake correction sharing ratio information. The correction amount calculation unit 225 also determines the Y of the subject image on the imaging surface of the imaging device 12 based on the angle change amount in the pitch direction calculated by the pitch angle blur amount calculation unit 222b and the focal length information of the optical system 21. The amount of movement in the direction (image blur amount) is calculated, and the amount of correction in the Y direction for canceling the amount of movement of the subject image in the Y direction is calculated based on the amount of movement in the Y direction and the shake correction sharing ratio information. . The focal length information of the optical system 21 is transmitted from the lens control unit 229, and the shake correction sharing ratio information is transmitted from the system controller 14 via the communication unit 228.

  The driver 226 a outputs a drive pulse corresponding to the correction amount in the X direction calculated by the correction amount calculation unit 225 to the optical system driving unit 23. As a result, the optical system driving unit 23 moves the blur correction lens in the X direction by an amount corresponding to the correction amount in the X direction.

  The driver 226 b outputs a drive pulse corresponding to the correction amount in the Y direction calculated by the correction amount calculation unit 225 to the optical system driving unit 23. As a result, the optical system driving unit 23 moves the blur correction lens in the Y direction by an amount corresponding to the correction amount in the Y direction.

  The integrating unit 227a integrates the yaw angular velocity obtained via the yaw angular velocity sensor 24a, the ADC 221a, and the reference value subtracting unit 222a. Further, in response to the reception of the average value acquisition request command transmitted from the system controller 14 via the communication unit 228, the integration unit 227a obtains the average value of the yaw angular velocities accumulated so far, and obtains the average value of the yaw angular velocity. Is transmitted to the system controller 14 and the accumulated yaw angular velocity is cleared. Thus, every time an average value acquisition request command is received from the system controller 14, the average value of yaw angular velocities accumulated from the reception of the previous average value acquisition request command to the reception of the current average value acquisition request command is calculated. It is transmitted to the system controller 14. Therefore, the integration period of the yaw angular velocity by the integrating unit 227a can be controlled by the system controller 14. In addition, the longer the integration period, the more accurate the lens side yaw offset value can be calculated.

  The integration unit 227b integrates the pitch angular velocity obtained through the pitch angular velocity sensor 24b, the ADC 221b, and the reference value subtraction unit 222b. Further, in response to the reception of the average value acquisition request command transmitted from the system controller 14 via the communication unit 228, the integration unit 227b obtains the average value of the pitch angular velocities accumulated so far and obtains the average value of the pitch angular velocity. And the pitch angular velocity accumulated so far is cleared. Thus, every time an average value acquisition request command is received from the system controller 14, the average value of pitch angular velocities accumulated from the reception of the previous average value acquisition request command to the reception of the current average value acquisition request command is calculated. It is transmitted to the system controller 14. Accordingly, the integration period of the pitch angular velocity by the integration unit 227b can be controlled by the system controller 14. Further, the longer the integration period, the more accurate calculation of the lens side pitch offset value becomes possible.

The communication unit 228 communicates with the system controller 14.
The lens control unit 229 controls focusing, zooming, aperture, and the like under the control of the system controller 14. In addition, the lens control unit 229 monitors the state of the optical system 21 and responds to a lens status information acquisition request command transmitted from the system controller 14 via the communication unit 228 (hereinafter, “information on the state of the optical system 21”). The status information of the optical system 21 ”is transmitted to the system controller 14 via the communication unit 228. The state information of the optical system 21 includes information such as the focal length of the optical system 21, the focus lens position, and the blur correction range by the LCU 22. Here, the blur correction range by the LCU 22 is an image blur correction range that can be corrected by the blur correction by the LCU 22, and is determined by the focal length of the optical system 21. Further, the lens control unit 229 transmits the focal length information of the optical system 21 to the correction amount calculation unit 225.

  As described above, the ROM 22a stores lens-side blur detection accuracy information. The lens-side blur detection accuracy information is read in response to an accuracy information acquisition request command transmitted from the system controller 14 via the communication unit 228 and transmitted to the system controller 14 via the communication unit 228.

  In the camera system according to the present embodiment having such a configuration, the configuration related to blur correction included in the interchangeable lens 2 is an example of a first blur correction unit that corrects image blur due to blur. The configuration related to blur correction included in the camera body 1 is an example of a second blur correction unit that corrects image blur due to blur. The angular velocity sensor 24 (24a, 24b) of the interchangeable lens 2 is an example of a first blur amount detection unit that detects a blur amount. The reference value subtracting unit 222 (222a, 222b) of the LCU 22 of the interchangeable lens 2 has a first value corresponding to the output value of the first blur detecting unit at rest from the blur amount detected by the first blur amount detecting unit. It is an example of the 1st reference value subtraction part which subtracts these reference values. The angular velocity sensor 16 (16a, 16b) of the camera body 1 is an example of a second shake amount detection unit that detects a shake amount. The reference value subtraction unit 152 (152a, 152b) of the shake correction microcomputer 15 of the camera body 1 corresponds to the output value of the second shake detection unit at rest from the shake amount detected by the second shake amount detection unit. It is an example of the 2nd reference value subtraction part which subtracts the 2nd reference value to do. The integration unit 227 (227a, 227b) of the LCU 22 of the interchangeable lens 2 is a blur detected by the first blur amount detection unit during a predetermined period and subtracted by the first reference value by the first reference value subtraction unit. It is an example of the 1st average value calculation part which calculates the average value of quantity. The integration unit 156 (156a, 156b) of the shake correction microcomputer 15 of the camera body 1 is detected by the second shake amount detection unit during the predetermined period, and the second reference value subtraction unit sets the second reference value. It is an example of the 2nd average value calculation part which calculates the average value of the subtracted blur amount. Some functions of the system controller 14 of the camera body 1 are based on the difference between the average value calculated by the first average value calculation unit and the average value calculated by the second average value calculation unit. This is an example of a reference value correction unit that corrects the reference value or the second reference value. The ROM 22a in which the lens-side blur detection accuracy information is stored is an example of a first storage unit in which first blur detection accuracy information regarding the blur detection accuracy of the first blur correction unit is stored. The ROM 17 in which the body-side shake detection accuracy information is stored is an example of a second storage unit in which second shake detection accuracy information regarding the shake detection accuracy of the second shake correction unit is stored. Other functions of the system controller 14 of the camera body 1 are the first blur detection accuracy information stored in the first storage unit and the second blur detection accuracy stored in the second storage unit. It is an example of a determination unit that determines which of the first blur correction unit and the second blur correction unit has higher blur detection accuracy based on the information. The optical system driving unit 23 is an example of a first blur correction mechanism. The image sensor driving unit 13 is an example of a second blur correction driving unit. The configuration for driving the optical system drive unit 23 based on the output of the reference value subtraction unit 222 (222a, 222b) and the shake correction sharing ratio information in the LCU 22 is the first reference value subtraction unit. An example of a first blur correction driving unit that drives the first blur correction mechanism based on the blur amount from which the value is subtracted and the blur correction sharing ratio of the first blur correction unit and the second blur correction unit. It is. The configuration for driving the image sensor driving unit 13 based on the output of the reference value subtraction unit 152 (152a, 152b) and the shake correction sharing ratio information in the shake correction microcomputer 15 is the second reference value subtraction unit. 2 is an example of a second shake correction driving unit that drives a second shake correction mechanism based on a shake amount obtained by subtracting a reference value of 2 and a shake correction sharing ratio.

  FIG. 6 is an example of a flowchart showing the processing content of the reference value correction processing performed by the system controller 14 of the camera body 1. Note that the processing of the flowchart shown in FIG. 6 is, for example, processing that is periodically repeated. Here, “periodic” means, for example, every second.

  As shown in FIG. 6, when this process starts, the system controller 14 transmits an average value acquisition request command to the LCU 22, and the average value of the yaw angular velocity and the average of the pitch angular velocity from the LCU 22 (integration units 227a and 227b). A value is acquired (S100).

  Subsequently, the system controller 14 transmits an average value acquisition request command to the blur correction microcomputer 15 and acquires the average value of the yaw angular velocity and the average value of the pitch angular velocity from the blur correction microcomputer 15 (integration units 156a and 156b) ( S102).

Note that either S100 or S102 may be performed first.
Subsequently, the system controller 14 performs a process of calculating an offset value of the reference value (S104). More specifically, the system controller 14 calculates the difference between the average value of the yaw angular velocity on the interchangeable lens 2 side acquired in S100 and the average value of the yaw angular velocity on the camera body 1 side acquired in S102 as the lens side blur detection accuracy. Based on the information and the body side blur detection accuracy information, the body side yaw offset value or the lens side yaw offset value is calculated, and the average value of the pitch angular velocity on the interchangeable lens 2 side acquired in S100 and the camera acquired in S102 The difference from the average value of the pitch angular velocity on the body 1 side is calculated as the body side pitch offset value or the lens side pitch offset value based on the lens side blur detection accuracy information and the body side blur detection accuracy information. The lens-side blur detection accuracy information is acquired by the system controller 14 from the LCU 22 as a response by transmitting an accuracy information acquisition request command to the LCU 22. The body-side blur detection accuracy information is read from the ROM 17.

  Subsequently, the system controller 14 performs a process of correcting the reference value (S106). More specifically, the system controller 14 transmits the body-side yaw offset value or the lens-side yaw offset value calculated in S104 to the camera body 1 or the interchangeable lens 2, and the body-side pitch offset value calculated in S104 or The lens side pitch offset value is transmitted to the camera body 1 or the interchangeable lens 2. Thereby, the body side yaw reference value or the lens side yaw reference value is corrected, and the body side pitch reference value or the lens side pitch reference value is corrected.

The process of the flowchart shown in FIG. 6 will be described also in the process of the system controller 14 shown in FIG. 9 described later.
FIG. 7 is an example of a flowchart showing the processing content of the reference value correction processing performed by the blur correction microcomputer 15 of the camera body 1.

  As shown in FIG. 7, when this process is started, the blur correction microcomputer 15 first determines whether or not the detection cycle has elapsed (S200). The detection cycle is a cycle in which the ADC 151 (151a, 151b) performs AD (Analog-to-digital) conversion in order to detect the angular velocity. For example, when the sampling rate (AD conversion rate) of the ADC 151 is 1 kHz, the detection cycle is 1 ms. Further, this detection cycle is a period shorter than the repetition cycle when the process of the flowchart shown in FIG. 6 is periodically repeated.

  If the determination result in S200 is Yes, the integration unit 156a of the blur correction microcomputer 15 integrates the yaw angular velocity obtained so far by using the yaw angular velocity obtained by performing AD conversion by the ADC 151a and subtracting the body side yaw reference value by the reference value subtracting unit 152a. The integration unit 156b of the blur correction microcomputer 15 integrates the pitch angular velocity obtained by performing AD conversion by the ADC 151b and subtracting the body side pitch reference value by the reference value subtracting unit 152b into the integrated value of the pitch angular velocity so far. (S202).

  On the other hand, if the determination result in S200 is No, or after S202, the blur correction microcomputer 15 determines whether or not an average value acquisition request command has been received from the system controller 14 (S204).

  When the determination result in S204 is Yes, the integration unit 156a of the shake correction microcomputer 15 obtains an average value of the yaw angular velocities accumulated so far and transmits the average value to the system controller 14, and also the integration unit 156b of the shake correction microcomputer 15 Obtains the average value of the pitch angular velocities accumulated so far and transmits it to the system controller 14 (S206).

  After S206, the integration unit 156a of the shake correction microcomputer 15 clears the yaw angular velocity accumulated so far (the integrated value of the yaw angular velocity), and the integration unit 156b of the shake correction microcomputer 15 performs the pitch angular velocity accumulated so far. (Pitch angular velocity integrated value) is cleared (S208).

On the other hand, if the determination result in S204 is No, or after S208, the process returns to S200, although not shown.
Note that the processing of the flowchart shown in FIG. 7 will be described in the processing of the shake correction microcomputer 15 shown in FIG. 9 described later.

FIG. 8 is an example of a flowchart showing the processing content of the reference value correction processing performed by the LCU 22 of the interchangeable lens 2.
As shown in FIG. 8, when this process is started, the LCU 22 first determines whether or not the detection cycle has elapsed (S300). The detection cycle is a cycle in which the ADC 221 (221a, 221b) performs AD conversion in order to detect the angular velocity. For example, when the sampling rate of the ADC 221 is 1 kHz, the detection cycle is 1 ms. Further, this detection cycle is a period shorter than the repetition cycle when the process of the flowchart shown in FIG. 6 is periodically repeated.

  When the determination result in S300 is Yes, the integrating unit 227a of the LCU 22 integrates the yaw angular velocity obtained by performing AD conversion by the ADC 221a and subtracting the lens side yaw reference value by the reference value subtracting unit 222a into the integrated value of the yaw angular velocity so far. At the same time, the integrating unit 227b of the LCU 22 integrates the pitch angular velocity obtained by performing AD conversion by the ADC 221b and subtracting the lens-side pitch reference value by the reference value subtracting unit 222b on the integrated value of the pitch angular velocity thus far (S302).

  On the other hand, if the determination result in S300 is No, or after S302, the LCU 22 determines whether or not an average value acquisition request command has been received from the system controller 14 (S304).

  When the determination result in S304 is Yes, the integration unit 227a of the LCU 22 calculates the average value of the yaw angular velocities accumulated so far and transmits it to the system controller 14, and the integration unit 227b of the LCU 22 integrates so far. The average value of the pitch angular velocities obtained is obtained and transmitted to the system controller 14 (S306).

  After S306, the integrating unit 227a of the LCU 22 clears the yaw angular velocity accumulated so far (the integrated value of the yaw angular velocity), and the integrating unit 227b of the LCU 22 includes the pitch angular velocity accumulated so far (the integrated value of the pitch angular velocity). ) Is cleared (S308).

On the other hand, if the determination result in S304 is No, or after S308, the process returns to S300, although not shown.
Note that the processing of the flowchart shown in FIG. 8 will be described in the processing of the LCU 22 shown in FIG. 9 described later.

  FIG. 9 is a flowchart showing details of processing contents when the system controller 14 of the camera body 1 performs reference value correction processing while communicating with each of the blur correction microcomputer 15 of the camera body 1 and the LCU 22 of the interchangeable lens 2. It is an example. The flowchart shown in FIG. 9 includes the processes of the flowcharts shown in FIGS.

  As shown in FIG. 9, when the camera system according to the present embodiment is activated and this process is started, first, the system controller 14 transmits an accuracy information acquisition request command to the LCU 22, and in response thereto, the lens from the LCU 22 Side blur detection accuracy information is received (acquired) (S400, S500).

  Subsequently, the system controller 14 performs high-precision determination of blur detection accuracy based on the lens-side blur detection accuracy information acquired in S400 and the body-side blur detection accuracy information read from the ROM 17 (S402). More specifically, the system controller 14 calculates the lens side yaw reference value accuracy information included in the lens side blur detection accuracy information and the body side yaw reference value accuracy information included in the body side blur detection accuracy information from the lens side. Judgment which accuracy of yaw reference value and body side yaw reference value is higher, accuracy information of lens side pitch reference value included in lens side blur detection accuracy information, and body included in body side blur detection accuracy information From the accuracy information of the side pitch reference value, it is determined which accuracy of the lens side pitch reference value and the body side pitch reference value is higher.

  If it is determined in S402 that the accuracy of the lens side yaw reference value is equal to that of the body side yaw reference value, and the accuracy of the lens side pitch reference value is equal to that of the body side pitch reference value, the processing after S410 described later is performed. The process may return to S404, which will be described later, after S408, which will be described later.

  After S402, the system controller 14 transmits a lens status information acquisition request command to the LCU 22, and as a response, the status information of the optical system 21 (focal length, lens position for focus, and information on the blur correction range by the LCU 22) is transmitted from the LCU 22. (Including) is received (acquired) (S404, S502).

  Subsequently, the system controller 14 performs the shake correction when the shake correction microcomputer 15 and the LCU 22 share the shake correction (when the shake correction by the shake correction microcomputer 15 and the shake correction by the LCU 22 are combined to perform the shake correction). The shake correction sharing ratio between the microcomputer 15 and the LCU 22 is calculated (S406). For example, the system controller 14 calculates the shake correction sharing ratio according to the ratio of the shake correction range by the shake correction microcomputer 15 and the shake correction range by the LCU 22. The blur correction range by the blur correction microcomputer 15 is an image blur correction range that can be corrected by the blur correction by the blur correction microcomputer 15, and the information is stored in the ROM 17, for example. The blur correction range by the LCU 22 corresponds to the information on the blur correction range by the LCU 22 included in the state information of the optical system 21 acquired in S404. In this example, the shake correction sharing ratio is calculated in this way, but this may be calculated by other methods, for example, or may be a fixed ratio such as 1: 1.

  Subsequently, the system controller 14 transmits (notifies) the shake correction sharing ratio calculated in S406 to each of the LCU 22 and the shake correction microcomputer 15, and each of the LCU 22 and the shake correction microcomputer 15 receives (acquires) this. (S408, S504, S600).

  Subsequently, the system controller 14 determines whether or not the average value acquisition cycle has elapsed (S410). The average value acquisition cycle is a transmission cycle of an average value acquisition request command that the system controller 14 transmits to each of the LCU 22 and the shake correction microcomputer 15.

If the determination result in S410 is No, the process returns to S404.
On the other hand, when the determination result in S410 is Yes, the system controller 14 transmits an average value acquisition request command to each of the LCU 22 and the shake correction microcomputer 15, and in response, from each of the LCU 22 and the shake correction microcomputer 15, The average value of the angular velocities and the average value of the pitch angular velocities are received (acquired) (S412, S506, S602). Here, if the difference between the transmission timings of the average value acquisition request command to the LCU 22 and the average value acquisition request command to the shake correction microcomputer 15 is set within the angular velocity detection cycle, the deviation of the angular velocity integration period is a maximum of one detection cycle. Can be suppressed. For example, if the sampling rate of the angular velocity is 1 kHz, the difference in transmission timing may be within 1 ms.

  Subsequently, the system controller 14 performs a process of calculating an offset value of the reference value (S414). More specifically, the system controller 14 determines the difference between the average value of the yaw angular velocity acquired from the LCU 22 in S412 and the average value of the yaw angular velocity acquired from the shake correction microcomputer 15 in S412 according to the determination result in S402. The body side yaw offset value or the lens side yaw offset value is calculated. That is, in the determination of S402, if it is determined that the accuracy of the body side yaw reference value is higher than the accuracy of the lens side yaw reference value, the difference between the average values of the yaw angular velocities is determined as the lens side yaw offset. If the determination result is that the accuracy of the lens side yaw reference value is higher than the accuracy of the body side yaw reference value, the difference is calculated as the body side yaw offset value. . Further, the system controller 14 determines the difference between the average value of the pitch angular velocities acquired from the LCU 22 in S412 and the average value of the pitch angular velocities acquired from the shake correction microcomputer 15 in S412 according to the determination result in S402. It is calculated as a side pitch offset value or a lens side pitch offset value. That is, in the determination of S402, if it is determined that the accuracy of the body-side pitch reference value is higher than the accuracy of the lens-side pitch reference value, the difference between the average values of the pitch angular velocities is determined as the lens-side pitch offset value. If the determination result is that the accuracy of the lens-side pitch reference value is higher than the accuracy of the body-side pitch reference value, the difference is calculated as the body-side pitch offset value. .

  Subsequently, the system controller 14 determines whether the blur detection accuracy in both the yaw direction and the pitch direction is higher on the camera body 1 side than on the interchangeable lens 2 side based on the determination result in S402 ( S416). In this determination, the accuracy of the body side yaw reference value is higher than the accuracy of the lens side yaw reference value based on the determination result in S402, and the body side pitch is higher than the accuracy of the lens side pitch reference value. It also determines whether or not the condition that the accuracy of the reference value is higher is satisfied.

  If the determination result in S416 is No, the system controller 14 determines that the accuracy of the lens side yaw reference value is higher than the accuracy of the body side yaw reference value in the determination in S402. , The body side yaw offset value calculated in S414 is transmitted to the blur correction microcomputer 15, and the determination result in the determination in S402 is that the accuracy of the lens side pitch reference value is higher than the accuracy of the body side pitch reference value. If it is, the body side pitch offset value calculated in S414 is transmitted to the blur correction microcomputer 15 (S418).

  When one or both of the body side yaw offset value and the body side pitch offset value are transmitted in S418, the blur correction microcomputer 15 receives one or both of them, and based on one or both of them, the body side yaw reference One or both of the value and the body side pitch reference value are updated (S604). Thereby, one or both of the body side yaw reference value and the body side pitch reference value is corrected, and the blur detection accuracy of one or both of the yaw direction and the pitch direction on the camera body 1 side can be improved.

  On the other hand, if the determination result in S416 is Yes, or after S418, the system controller 14 replaces the shake detection accuracy in the yaw direction and the pitch direction with respect to the camera body 1 side based on the determination result in S402. It is determined whether or not the lens 2 side is higher (S420). In this determination, the accuracy of the lens side yaw reference value is higher than the accuracy of the body side yaw reference value based on the determination result in S402, and the lens side pitch is higher than the accuracy of the body side pitch reference value. It also determines whether or not the condition that the accuracy of the reference value is higher is satisfied.

  If the determination result in S420 is No, the system controller 14 determines that the accuracy of the body side yaw reference value is higher than the accuracy of the lens side yaw reference value in the determination in S402. The lens side yaw offset value calculated in S414 is transmitted to the LCU 22, and the determination result in S402 is that the accuracy of the body side pitch reference value is higher than the accuracy of the lens side pitch reference value. In this case, the lens side pitch offset value calculated in S414 is transmitted to the LCU 22 (S422).

  When one or both of the lens side yaw offset value and the lens side pitch offset value are transmitted in S422, the LCU 22 receives one or both of them, and based on one or both of them, the lens side yaw reference value and lens One or both of the side pitch reference values are updated (S508). Thereby, one or both of the lens side yaw reference value and the lens side pitch reference value is corrected, and the blur detection accuracy of one or both of the yaw direction and the pitch direction on the interchangeable lens 2 side can be improved.

On the other hand, if the determination result in S420 is Yes, or after S422, the process returns to S404.
In the camera system according to the present embodiment, as described above, the blur detection accuracy on the interchangeable lens 2 side is higher than the blur detection accuracy on the camera body 1 side in both the yaw direction and the pitch direction. 6 to 9 are performed, the camera body 1 side reference values (the body side yaw reference value and the body side pitch reference value) are corrected, and the camera body 1 side blur detection accuracy is corrected. However, it will be improved up to the blur detection accuracy on the interchangeable lens 2 side.

  In the camera system according to the present embodiment, the LCU 22 and the shake correction microcomputer 15 share the shake correction according to the shake correction sharing ratio described above, and the combination of the shake correction by the LCU 22 and the shake correction by the shake correction microcomputer 15 is combined. Blur correction is performed.

  As described above, according to the camera system according to the present embodiment, both the camera body 1 and the interchangeable lens 2 have the blur correction function, and there is a difference in blur detection accuracy between the blur correction functions of both. Can improve the blur detection accuracy on the low accuracy side to the equivalent of the blur detection accuracy on the high accuracy side. In addition, when the blur correction is performed, both blur correction functions are shared and operated, so that the blur correction range can be expanded as compared with the case where only one of the blur correction functions is operated. Therefore, in the camera system according to the present embodiment, when shake correction is performed by combining the shake correction functions of both the camera body 1 and the interchangeable lens 2, even if there is a difference in the shake detection accuracy of both shake correction functions, Compared to the case where only one blur correction function is used, the blur correction performance can be improved.

  In the camera system according to the present embodiment, when blur correction is performed by combining the camera body 1 and the interchangeable lens 2 with the camera shake correction function, the camera shake detection result detected by one camera shake correction function is used. It is not necessary to transmit to the correction function, and it is not necessary to transmit the remaining correction information that could not be corrected by one blur correction function to the other blur correction function. Therefore, in the camera system according to the present embodiment, the blur correction performance is deteriorated due to the delay in the response of the blur correction operation due to the signal delay caused by the transmission and the deterioration of the blur detection signal due to the routing of the signal wiring necessary for the transmission. Such a problem does not occur.

Various modifications are possible in the camera system according to the present embodiment.
For example, in the camera system according to the present embodiment, the interchangeable lens 2 is configured such that a reference value corresponding to the temperature detected by the thermistor 25 is used, but such a configuration is used on the interchangeable lens 2 side. Alternatively, the camera body 1 may be provided. That is, the camera body 1 may include a thermistor, and the camera body 1 may use a reference value corresponding to the temperature detected by the thermistor.

  In addition, for example, in the camera system according to the present embodiment, the reference value output unit 223 of the LCU 22 of the interchangeable lens 2 uses a first-order approximation expression that represents the relationship between the temperature and the reference value instead of the temperature table. A reference value corresponding to the temperature may be output.

  Further, for example, in the camera system according to the present embodiment, the calculation of the average value of the angular velocities performed by each of the integration unit 156 of the shake correction microcomputer 15 of the camera body 1 and the integration unit 227 of the LCU 22 of the interchangeable lens 2 is performed. The system controller 14 of the camera body 1 may perform this. That is, the system controller 14 transmits an integrated value acquisition request command instead of transmitting an average value acquisition request command to the shake correction microcomputer 15 and the LCU 22, and acquires an integrated value (an integrated value of angular velocity) from each as a response. Then, each average value may be calculated from the integrated value.

  Further, for example, in the camera system according to the present embodiment, the system controller 14 of the camera body 1 may acquire the shake detection accuracy information on the interchangeable lens 2 side as follows. For example, in the ROM 17 of the camera body 1, correspondence information between the identification information of the interchangeable lens and the shake detection accuracy information of the interchangeable lens is stored in advance, and the system controller 14 mounts the interchangeable lens on the camera body 1. Sometimes, the identification information may be acquired from the interchangeable lens, and the blur detection accuracy information corresponding to the identification information may be acquired based on the correspondence information.

  As mentioned above, the embodiment described above shows a specific example of the present invention in order to facilitate understanding of the invention, and the present invention is not limited to the above-described embodiment. The present invention can be variously modified and changed without departing from the concept of the present invention defined in the claims.

DESCRIPTION OF SYMBOLS 1 Camera body 2 Interchangeable lens 3 Contact point 11 Focal plane shutter 12 Image pick-up element 13 Image pick-up element drive part 14 System controller 15 Shake correction microcomputer 16a Yaw angular velocity sensor 16b Pitch angular velocity sensor 17 ROM
21 Optical system 22 LCU
22a ROM
23 Optical system drive unit 24a Yaw angular velocity sensor 24b Pitch angular velocity sensor 25 Thermistor 151a, 151b ADC
152a, 152b Reference value subtraction unit 153a Yaw angle blur amount calculation unit 153b Pitch angle blur amount calculation unit 154 Correction amount calculation unit 155a, 155b Driver 156a, 156b Integration unit 157 Communication unit 221a, 221b, 221c ADC
222a, 222b Reference value subtraction unit 223 Reference value output unit 224a Yaw angle blur amount calculation unit 224b Pitch angle blur amount calculation unit 225 Correction amount calculation unit 226a, 226b Drivers 227a, 227b Integration unit 228 Communication unit 229 Lens control unit

Claims (7)

A camera system including an interchangeable lens including a first blur correction unit that corrects image blur due to blur, and a camera body including a second blur correction unit that corrects image blur due to blur,
The first blur correction unit includes:
A first blur amount detector for detecting a blur amount;
A first reference value subtraction unit that subtracts a first reference value corresponding to an output value of the first blur detection unit at rest from the blur amount detected by the first blur amount detection unit;
Including
The second blur correction unit is
A second blur amount detector for detecting the blur amount;
A second reference value subtraction unit that subtracts a second reference value corresponding to an output value of the second blur detection unit at rest from the blur amount detected by the second blur amount detection unit;
Including
The camera system includes:
First average value calculation for calculating an average value of blur amounts detected by the first blur amount detection unit and subtracted by the first reference value subtraction unit during a predetermined period. And
A second average value for calculating an average value of blur amounts detected by the second blur amount detection unit and subtracted by the second reference value subtraction unit during the predetermined period. A calculation unit;
Based on the difference between the average value calculated by the first average value calculation unit and the average value calculated by the second average value calculation unit, the first reference value or the second reference value is calculated. A reference value correction unit to be corrected;
A camera system comprising: The camera system includes:
A first storage unit storing first blur detection accuracy information related to blur detection accuracy of the first blur correction unit;
A second storage unit storing second blur detection accuracy information related to blur detection accuracy of the second blur correction unit;
Based on the first blur detection accuracy information stored in the first storage unit and the second blur detection accuracy information stored in the second storage unit, the first blur correction unit and A determination unit for determining which of the second blur correction units has higher blur detection accuracy;
Including
The reference value correction unit corrects the second reference value when the determination unit determines that the first shake correction unit has higher shake detection accuracy than the second shake correction unit, The second reference correction unit corrects the first reference value when the determination unit determines that the blur detection accuracy is higher than that of the first shake correction unit;
The camera system according to claim 1. The camera body is an average value or integrated value of blur amounts detected by the first blur amount detection unit and subtracting the first reference value by the first reference value subtraction unit during the predetermined period. To the interchangeable lens, a command for acquiring the image from the interchangeable lens,
The camera body transmits an offset value of the first reference value to the interchangeable lens;
The camera system according to claim 1 or 2, characterized in that The camera body transmits a command for acquiring first blur detection accuracy information stored in the first storage unit from the interchangeable lens to the interchangeable lens.
The camera system according to claim 2 or 3, wherein The first blur correction unit includes a blur amount obtained by subtracting the first reference value by the first reference value subtraction unit, and blur correction of the first blur correction unit and the second blur correction unit. Based on the sharing ratio, including a first blur correction driving unit that drives the first blur correction mechanism,
The second shake correction unit drives a second shake correction mechanism based on the shake amount obtained by subtracting the second reference value by the second reference value subtraction unit and the shake correction sharing ratio. Including a second blur correction drive unit,
The camera system according to any one of claims 1 to 4, wherein The blur correction sharing ratio is determined based on optical system state information related to the state of the optical system included in the interchangeable lens.
The camera system according to claim 5. A first reference value corresponding to the output value of the first blur amount detection unit at rest is subtracted from the blur amount detected by the first blur amount detection unit, and based on the blur amount after the subtraction. The output value of the second blur amount detection unit at rest is calculated from the interchangeable lens including the first blur correction unit that corrects the image blur due to the blur and the blur amount detected by the second blur amount detection unit. And a camera body including a second blur correction unit that subtracts a second reference value corresponding to the image and corrects image blur due to blur based on the subtracted blur amount. Because
Calculating a first average value that is an average value of blur amounts detected by the first blur amount detection unit and subtracting the first reference value during a predetermined period;
Calculating a second average value that is an average value of blur amounts detected by the second blur amount detection unit and subtracting the second reference value during the predetermined period;
Correcting the first reference value or the second reference value based on a difference between the first average value and the second average value;
A blur correction method characterized by the above.